The goal of "The 123s" is to present the increasingly large body of private school choice research in a clear and easy-to-read format and cite the relevant studies so that anyone who is interested in the individual results can easily find them and read in more detail. This report is divided into 11 sections. First it summarizes the number of studies and how many come to which conclusion. The following sections present the eight outcomes covered in this publication, including school safety and climate-- a new subject of study. They are followed by a list of reviews that other researchers conducted about the eight outcomes covered. The last section discusses the strengths and limitations of research on school choice. Finally, tables in the Appendix present the various programs, organized by type.